73 



Polygonum fuliis sagitlatis, caule aculeato Gmel. Fl. Sib. HI. p. 6.5^ 

 tab. 13, fig. 2. 



PoUgonum Sieholdii A. Gray in Parry's Exped. Jap. II. p. 317. 



Stem often geniculato-divaricato-ramose and often shortly decumbent 

 at the base ; branches slender, erect, loosely ramose, retrorsely aculeate on 

 the angles. Leaves petiolate, sagittato-oblong-lanceolate, or sagittato-lan- 

 ceolate, smooth-margined, retrorsely aculeate at the base of the midrib 

 beneath ; petiole often retrorsely aculeate. Flowers capitate. Akene 

 trigonous. Flowers May-June, but sometimes August on mountains. 



Hah. Prov. Tosa : Sakawa (7^ 31aldno\ 1885, 1891), Tokano {T. 

 Mahino\ June 10, 11, 1889, June 1893), Doi in Aid {T. BIakino\ June 

 3, 1892) ; Prov. Iyo : Kuwabara {K. Okmhiira ! June 7, 1897) ; Prov. 

 BuzEN : Mt. Iwadake {R. Yatabe and J. Matsumura ! herb. Sc. Coll. Imp. 

 Univ. Tokyo, July 17, 1882) ; Prov. Musashi : Omiya in Wada-raura (21 

 MaUno\ June 3, 1888, May 1.5, 1901), Near Fuchu {T. Maldno\ May 27, 

 1894), Setagaya {T. Maldno\ May 6, 1894), Shimoshakusliii {T. Mahino\ 

 May 20, 1900), Onden {T. Maldno ! June 1900) ; Prov. Idzu : Yuga- 

 shima [S. Okuho ! herb. ibid. June 14, 1883) ; Prov. Suo : Ouchi-mura {D. 

 Nikai ! herb. ibid. June 5, 1892) ; Prov. Shimotsuke : Nikko {11. Yatabe 1 

 herb. ibid. Aug. 1, 1S77 ; T. Maldno 1900, Aug. 1903). 



Widely distributed over this country. 



/9. americanum Meisn. in DC. Prodr. XIV. p. 132 ; Herd, in Act. 

 Hort. Petrop. XI. p. 25.3. 



Polygonum sagittaium Linn. Sp. PI. p. 363, Cod. n. 2871, ex parte. 



Polygonum sagittatum a. boreale Meisn. Monogr. Polygon, p. 65 ; 

 Ledeb. Fl. Ross. III. p. 529, ex parte. 



Polygonum sagittatum ^. boreale Hook. Fl. Bor.-Amer. II. p. 131. 



Polygonum sagittatum Ait. Hort. Kew. ed. 2, II. p. 420 ; A. Gray 

 Man. Bot. et. .5, p. 418; 0. Kuntze Rev. Gen. PL II. p. 559. 



forma Sieboldi (Meisn.) Maldno. 



Polygonum Sieboldi Meisn. in DC. Prodr. XIV. p. 133, et in Miq. 

 Ann. Mus. Bot. Lugd.-Bat. II. ]\ 63 ; Miq. Prol. Fl. Jap. p. 300 ; Franch. 

 et Sav. Enum. PI. Jap. I. p. 400 ; Maxim, in Mel. Biol. IX. p. 617. 



Pol ygonum sagittatum var. Sieboldi Maxim, in litt. 



Polygonum sagittatum Thunb. Fl. Jap. p. ].67, ex parte. 



Polygonum sagittatum (L.) Sieb. in Herb. Lugd.-Bat. ex Meisn. 



Polygonum sagittatum l^ranch. et Sav. Enum. PI. Jap. II, p. 476. 



Similar to the American plant in size and form, but the leaves quite 

 Igabrous on the margin. Flowers in autumn. 



